Pentair 520670 IntelliChlor® Acid Washing Kit for Easytouch® Control Systems - The IntelliChlor Acid Washing Kit fits EasyTouch Control System. The IntelliChlor and iChlor Electrolytic Cell must be acid cleaned if excessive scale forms between the plates or debris is present. The kit includes O-ring, coupling nut, and closed-end union cap.